操作系统：windows操作系统，xp或win7.

C:\Users\Administrator>cd C:\Program Files\MySQL\MySQL Server 5.5\bin

C:\Program Files\MySQL\MySQL Server 5.5\bin>net stop mysql

MySQL 服务正在停止.

MySQL 服务已成功停止。

 C:\Program Files\MySQL\MySQL Server 5.5\bin>mysqld --skip-grant-tables

 你会看到窗口光标在下一行的第一个位置闪烁，这说明已经启动了，不需要管。

 新建一个命令行窗口同样进入到e:\mysql5.5\bin目录，启动mysql 

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.5.36 MySQL Community Server (GPL)

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> show databases;

+--------------------+

| Database           |

+--------------------+

| information_schema |

| mysql              |

| performance_schema |

| test               |

+--------------------+

4 rows in set (0.00 sec)

mysql> use mysql;

Database changed

mysql> update user set password=PASSWORD('oracle') where user='root';

Query OK, 2 rows affected (0.00 sec)

Rows matched: 2  Changed: 2  Warnings: 0

mysql> flush privileges;

Query OK, 0 rows affected (0.01 sec)

mysql> quit

Bye

看看那任务管理器中是否有mysqld.exe进程，如有，kill .

C:\Program Files\MySQL\MySQL Server 5.5\bin>net start mysql

MySQL 服务正在启动 .

MySQL 服务已经启动成功。

C:\Program Files\MySQL\MySQL Server 5.5\bin>mysql -uroot -poracle

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 1

Server version: 5.5.36 MySQL Community Server (GPL)

Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its

affiliates. Other names may be trademarks of their respective

owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql>